CN1935504B

CN1935504B - Composite elastic web

Info

Publication number: CN1935504B
Application number: CN2005101097749A
Authority: CN
Inventors: 杰弗里·艾伦·米德尔斯沃思; T·W·P·钟; 斯蒂芬·D·布鲁斯; 安德鲁·詹姆士·皮科克
Original assignee: Tredegar Film Products LLC
Current assignee: Feiteshi Film Products Co ltd
Priority date: 2004-09-21
Filing date: 2005-09-20
Publication date: 2012-03-28
Anticipated expiration: 2025-09-20
Also published as: CN101590710B; JP4567562B2; KR20060051489A; EP1637320B1; EP1637320A1; ES2357007T3; BRPI0503684A; DE602005025836D1; KR100745272B1; US20060062963A1; JP2006088702A; TWI296568B; US7351297B2; CN1935504A; CN101590710A; TW200615138A; EP1637320B2

Abstract

A method for producing a composite web includes supplying two or more webs to an activation mechanism, where the webs are in an unbonded state relative to each other. The method further entails simultaneously activating the webs while they are in a face to face relationship and in an unbonded state, and then bonding the webs to form a composite web.

Description

Composite elastic web

Technical field

Embodiment of the present invention relates to tablet; Thereby and activation has the method for flexibility when it is touched; The tablet of film or fibrous material; Perhaps the layered product of film and fibrous material for example uses in some product, and said some product is diaper, the goods that are used to control the incontinence effect, other amenities and bandage for example.Embodiment of the present invention also relates to the compound tablet that makes thus, and the goods that made by these tablets.

Background technology

Such as diaper, child with the absorbent article of urine trousers (training pants) or incontinence garment require can be closely, cosily fit in wearer, and when keeping skin health, can hold the secretion of health.Thereby ideally, the elastomeric material that is used for absorbent article should be soft when touching.The method that realizes flexibility can be: elastomeric material is laminated to the softness and the material of fiber normally, and nonwoven for example, thus form soft tablet.

Thereby have been found that through tablet is stretched on one or more directions to make the method for its " activation ", can make tablet when touching, have flexibility.Vertical or horizontal at tablet, or be described in United States Patent (USP) 4,223,059 in the method for both direction drawing of fiber or coating materials sheet simultaneously; 5,861,074; In 5,422,172 and 5,382,461; It is reference that above-mentioned document disclosure this paper separately all draws with it.

Relate to the drawing process of compound tablet like the activation stated of example in the above-mentioned document, said stretching exceeds the total extension property of the film or the non-woven tablet of constituent material.For the situation of non-woven tablet, fracture can appear in interfibrous combination.Thereby the material of being produced has flexibility when touching.Activation is accomplished through one of two kinds of methods usually.A kind of method comprises through one group of meshing gear (intermeshing gear) and stretches, and the opposing party's rule is included in the longitudinal stretching that (is driven with friction speed) between the driven voller at tablet.

United States Patent (USP) 5,143,679 disclose the activation method of two steps.The document discloses employed meshing gear, and wherein the depth of engagement in second step is greater than first step.Thereby the activation levels in second step will be higher than first step.

A weak point of activation is that this method destroyed the structure of non-woven material, particularly is used to have non-woven material or all the more so during the film laminates that only is made up of non-woven material when it.Thereby thereby be necessary in activation method, to use high-quality than expensive precursor non-woven material, in order to keep the feasible configurations in the activation product.Every square metre of 20g of commercial common employing (gsm) or higher basic weight.

The weak point and the problem of existing method described herein, material and facility are not the scope of the invention to be limited to have got rid of above-mentioned existing method, material and facility intentionally.In fact, certain embodiments of the invention can comprise one or more existing methods, material and facility, and do not have weak point as herein described or problem.

Summary of the invention

According to a first aspect of the invention; A kind of production method of compound tablet is provided; It comprises: (i) at least one non-woven tablet is fed into a stretching device with a porose elastic membrane with face-to-face relation; Said stretching device be used to stretch said non-woven tablet and said porose elastic membrane are stated non-woven tablet in said stretching device place and said porose elastic membrane is in unbound state each other; (ii) when said non-woven tablet and said porose elastic membrane are in face-to-face relation and are in unbound state; Said non-woven tablet is stretched with said porose elastic membrane; To promote flexibility, produce activation and unconjugated non-woven tablet and porose elastic membrane; Reach and (iii) adopt coupling apparatus; Said activation and unconjugated non-woven tablet and porose elastic membrane are combined with face-to-face relation; Thereby form compound tablet, wherein said non-woven tablet is by being selected from fibrous that polyethylene, polypropylene, polyester, man-made cellulose fibers, cellulose, nylon and their mixture process.

According to a second aspect of the invention, the compound tablet that is made by said method is provided.

According to a third aspect of the invention we, the absorbing products that contains above-mentioned compound tablet is provided.

In embodiment of the present invention, the tablet of activation, lamination is provided, said tablet contains the precursor non-woven material more cheap, that basic weight is lower, and wherein activation is that formation tablet (component web) in layered product is by before being combined and enforcement.After the activation, through adopting the pressure that activation process produced, will constitute tablet and combine with aspectant relation, prerequisite is that the interface between the tablet is applied enough heat.The elongation of finished product and tensile property preferably are superior to when being bonded to second tablet, carrying out the more expensive non-woven material of activation.

In activation process, it is believed that constituting tablet can move relative to each other in the tablet plane.Although do not have, believe that this characteristic can make from the precursor tablet with the lamination of the method activation and combination, can obtain more excellent elongation and tension values by the intention of any theory of operation constraint.

Description of drawings

In embodiment of the present invention, the combination of activation and thermal can be accomplished being equipped with on the conventional meshing gear activation equipment of the activation rolls of being heated.Can before being close to activation rolls, nonwoven and porose double-deck or three laminated elastomer films be contacted with each other.Their are simultaneously but be activated independently when two layers get in the roll gaps (nip).There is the some thousandths of inch far away near the closest approach of crown apart from the channel bottom of subtend on roller.Thermal promptly takes place herein, thereby nonwoven is embedded into softening elastomer film.The form that thermal is taked for activation rolls on the corresponding continuous lines of tooth (continuous lines).Then can be in a usual manner with the activated material cutting of gained and reel.

In further embodiment, can simultaneously two-layer nonwoven be combined with porose elastic membrane, thereby produce laminate structure; Or elastic membrane combined with single-layer nonwoven produce the double-layer lamination body.

Another embodiment comprises the layered product that is made up of at least a nonwoven and elastomer film of methods described herein manufacturing.This laminated material has improved elongation and tensile property.

Can be through understanding the present invention better with reference to the accompanying drawing of this paper general introduction.

Fig. 1 is the schematic diagram of embodiment of the present invention method, and it shows two tablets and is fed to a pair of activation rolls simultaneously with unbound state, then through against one of activation rolls to the tablet applied pressure, said two tablets are bonded to each other.

Fig. 2 is embodiment of the present invention the opposing party ratio juris figure.In the method, two tablets are fed to a pair of activation rolls simultaneously with unbound state, and tablet combined against one of activation rolls before activation in advance herein.When preparatory combination takes place, on identical activation rolls, carry out activation.

Fig. 3 is embodiment of the present invention the opposing party ratio juris figure.In this embodiment, tablet is fed to a pair of activation rolls simultaneously with unbound state, and uses that applied pressure makes the tablet combination with heat in the activation process.

The specific embodiment

Term used herein only is used to describe the purpose of particular, and the intention of unrestricted claim scope.As used in the disclosure in the whole text, singulative " (a) ", " one (an) " and " the " do not have other clear indication like context then should comprise plural reference.

As do not have other definition, all technology used herein all have and the identical implication of one skilled in the art's common sense of the present invention with scientific terminology.Although in the practice of embodiment of the present invention or test, can adopt and similar or any means and the material that are equal to described herein, described herein is preferable methods, equipment and material.All publications that this paper mentions all draw and are reference, are used for describing the purpose with public publication report and relevant various tablets, film, layered product, processing method and the goods that possibly adopt with the present invention.Should not be construed as and be to recognize that this type of disclosure is a prior art.

At whole specification, term " tablet (web) " refer to can coiled the material of volume.Tablet can be coating materials sheet, non-woven tablet, lamination tablet, porous layer swage set piece or the like.The face of tablet is meant one of two-dimensional surface relative with its edge.Term " compound tablet " is meant the tablet that comprises two or more independent tablets, and said independent tablet combines with face-to-face relation.Constitute the edge of tablet in conjunction with going directly, exist with aspectant relation each other although constitute tablet.The tablet of this paper contacts each other but does not have the combination that a tablet is fixed to another tablet with the surface when being in the surface, and soon tablet is described as being in against each other " unbound state ".

Term in this specification " film " is meant with curtain coating and extrudes or the fusion sheet material of blowing extrusion method through the extruded thermoplastic polymeric material, thereby cools off said sheet material then and form the tablet that the solid polymer tablet makes.Film can be monofilm, co-extruded films, coat film and composite membrane.Coat film is preferably the film that contains monofilm or co-extruded films, and said monofilm or co-extruded films apply the thin layer that (for example extrude coating, impression applies, printing etc.) has the identical or different material that combines with it subsequently.Preferably, in conjunction with after can this coating be isolated.Composite membrane is preferably the film that contains an above film, and wherein at least two films combine with associated methods.Associated methods can be introduced adhesive layer between rete.

In whole specification, statement language " perforated film " is meant the film that has a plurality of holes, and described hole extends to second surface from a surface.The two dimension perforated film is meant the film that does not have three-dimensional structure in the hole, and the second surface that described hole will be put down film is connected to the first surface of film.Three-dimensional films is the film with projection, and Threedimensional capstan membrane is the film of present in open pores three-dimensional structure (for example perforate has the degree of depth thicker than film thickness).

Term " non-woven material " is meant the tablet that contains a large amount of fibers.It maybe can be unconjugated that fiber can be bonded to each other.Fiber can be short fiber or long fibre.Fiber can contain single material, perhaps can contain multiple material, and form is the combination of different fibers or the combination of the like fibrous that each free different materials constitutes.

As used herein, " non woven fibre tablet " is to use by general meaning, and the planar structure that it is defined as relatively flat, pliable and tough and porous comprises short fiber or continuous filament yarn.For the detailed description of non-woven material, see that E.A. Vaughn shows " Nonwoven Fabric Primer andReference Sampler ", Association of the Nonwoven Fabrics Industry, the 3rd edition (1992).

Non-woven tablet can be the product that is used to form any means of this tablet, for example nonwoven, spunbond tablet and melt-blown non-woven tablet.Non-woven tablet can comprise the combination of compound tablet or tablet.In one embodiment, tablet is the spunbonded materials of being processed by polypropylene fibre.Yet non-woven tablet can comprise any polymeric material that can produce fiber.For example, non-woven tablet can comprise the fiber of polyethylene, polypropylene, elastomer, polyester, man-made cellulose fibers, cellulose, nylon, and the blend of this type of polymer fiber.Also but blend contains the fiber of various polymerization thing.

Term used herein " extensibility " is meant under the combination crack conditions that does not occur between fibrous fracture or the fiber, can be through tension force in the maximum tension amount (representing with the % mode, with respect to 0 strain regime) that puts on the assigned direction on the tablet.The non-woven tablet that can on any assigned direction, stretch is meant that when this direction applied tension force to tablet, tablet stretched on this direction, in tablet, induce stress, does not have the fracture of fibrous fracture or interfibrous combination basically.

Term used herein " screen cloth " is meant the three-dimensionally shaped equipment that contains indenture, and said indenture is used to form projection or the perforate in the film.In specific embodiments, screen cloth comprises the tubular element with width and diameter.In alternate embodiment, screen cloth comprises the band with width and length.Laterally be the direction parallel with the width of screen cloth.Vertically be parallel with the direction of rotation of screen cloth and with horizontal vertical direction.

Term used herein " perforation (perforation) " is meant the perforate (aperture) in the screen cloth.Term used herein " projection " is meant three-D elements, and it contains the perforate base portion on the plane that is positioned at the film first surface, reaches the upwardly extending side wall portion in the second surface side of film usually.Each base portion all has side wall portion.Side wall portion ends at " end " that be positioned at film second surface plane and locates.The end of projection can be perforate or not perforate.Perforate in the base portion of projection is also referred to as " first perforate ", is preferably polygonal shape, for example has the square of controlled or random pattern, hexagon, pentagon, ellipse, circle, avette or elongated shape.The end of projection is preferably polygon if perforate then is called " second perforate ", and is for example square, hexagon, pentagon, ellipse, circle, avette or elongated shape.

As used herein, statement " absorbing products " is meant the goods of absorption and receiving body fluids and other body exudates.More particularly, absorbing products comprises the health that leans on the wearer or the clothing approaching with wearers body, in order to absorb and to hold the secretion by the health discharging.As used herein; Term " elasticity " is used to describe the material that may extend to tensile elongation when applying tension force; Said tensile elongation is preferably at least 2 times of initial unstretched length, and after tensile force is removed, is retracted to maximum 1.75 times of its initial unstretched length.

Can use any film in the embodiment of the present invention.The parent material that is used for film preferably mixes and heats at the mixing of any appropriate and firing equipment, and said equipment is extrusion equipment for example.Extrusion method is to know in this area, the guidance of adopting this paper to provide, and extrusion method that can any appropriate prepares the molten sheet of film.Above-mentioned extrusion method comprises the mechanism with material feeding to extruder usually, and the mechanism of fusion and composite material transfers to the mechanism of shaping die with melted material, and makes the mechanism of the molten sheet cooling of polymer with the formation polymer film.Be laminated to the situation of molten sheet for second film or tablet, said second film or tablet can be participated in cooling procedure.

Be suitable for raw material is fed to that the method and apparatus of extruder normally knows.Preferred feeding mechanism comprises connecting gear, for example is connected to the vavuum pump of vacuum tube, and said pipe is immersed in the basin of polymeric material.Pump produces vacuum with controlled way in pipe, make pipe aspirate polymer and it is deposited on the feed hopper from basin.Feed hopper contains metering device usually, and the polymer deposition of the amount that said metering device will accurately be controlled is gone into the extruder reception cavity.Can there be a plurality of chambeies and feed hopper in the single extruder, thus but a plurality of components of charging.In addition, feed hopper or its vicinity can be equipped with anti static device or vibrating device, in order to the accurate measurement charging of auxiliary polyalcohol.This paper also can consider to use other feeding mechanisms known in the art or that find subsequently.

Preferred melt-shaping die head is a mold, but also can use the die head of other types, for example blown film die head.Die head forms the polymer sheet of fusion, makes its cooling subsequently and produces film or laminate structure.

In alternate embodiment, the polymer of fusion is made die head (smooth, the cylindrical plate that have a plurality of little openings) through spherolite and is left extruder.But when polymer passed die head, it formed polymer string (strings of polymer).Can make the cooling of polymer string subsequently, and through the rotating knife cutting, the string after cutting is called " compound pellet (compounded pellets) ".Can compound pellet be transferred to second extruder then, will mix spherolite fusion once more herein, transfer to die head and form sheet material, thereby said sheet material cools off formation film or laminate structure subsequently.In another replaceability configuration, can in second extruder, will mix spherolite and combine with other polymer spherolites.

Cooling body also is to know in this area, and can adopt current any cooling body known or that find afterwards to cool off the polymer that comes out from extruder, thereby forms film.Main cooling body can comprise embossing platform (embossing station), and said embossing platform contains two chill rolls that press each other.Molten polymer is passed through between the knurling rolls (being called engraved roll and backing roll respectively), make the polymer cooling through contacting herein with the cooler roller.Perhaps, roller can be the smooth chill roll that does not have engraved roll or knurling rolls.Another cooling device of knowing comprises passes through above the single roller polymer sheet, and molten polymer is applied gas curtain or cold water curtain, and it is contacted with single chill roll.Gas curtain with contacting all of roller cooling is worked.

Another cooling body of knowing is included in polymer sheet is passed through above the porous screen cloth.Vacuum makes polymer sheet closely contact with screen cloth, thereby causes the polymer cooling.In one embodiment, the combination of vacuum and screen cloth makes polymer sheet conform to the surface configuration of porous screen cloth, thereby in film, forms projection.The one side of the film of contact screen cloth is called the formed film inner surface, and the one side of the film relative with inner surface is called the formed film outer surface.Projection can be perforate, perhaps can be not perforate.The apertured polymeric film that forms in this way is to know in this area, like United States Patent (USP) 3,054,148; 4,155,693; 4,252,516; 4,508,256 and 4,509,908 examples are stated; It is reference that disclosure this paper of above-mentioned document all draws with it.

The additive method of perforation comprises passes through above the perforating roller (perforating roll) film, and said roller strap has the pin or the blade of protrusion, and when film passed through above the roller, said pin or blade promptly thrust film and produce hole.In these class methods, adopt back of the body rod usually, said back flow roll is fixing in position facing to perforating roller with film.Practical puncture takes place in the roll gap between perforating roller and back flow roll (backing roll) then.

The pair of rolls of usually passing gear-like through stretched film is accomplished the machine-direction oriented of meshing gear (IMG).Can go up at vertical (MD) or horizontal (TD) and implement IMG activation with respect to the tablet moving direction.In the MD activation, an axle gained roller viewgraph of cross-section of overlooking roller shows, the tooth incision of gear and around the periphery of roller, the substantially parallel axes of its major axis and roller.Tooth on roller engages in the groove on the adjacent roller, in order to tablet stretching action to be provided.

The roller strap that is used for the TD activation has along the axle of roller and fin (fin) and the groove that on the tablet direct of travel, alternately disposes.The fin of a roller and the engagement of the groove of adjacent roller, thus point is provided on adjacent fins, and tablet is stretched facing to said point in the horizontal.

In two types IMG activation, the axostylus axostyle that roller is installed is between two machine side plates, and first axostylus axostyle is preferably placed in the rigid bearing, and second axostylus axostyle is preferably placed in the bearing in the element slidably.Thereby through adopting the slidably position of element of wedge-shaped element scalable, said wedge-shaped element can be operated through adjustable screw or other devices.Back-outing or being screwed into wedge-shaped element to make vertical sliding members move respectively down or up, thereby the gear appearance tooth of second nip roller and first nip roller is further meshed or unclamp.The micrometer that is mounted to curb girder is indicated the depth of engagement of the tooth of nip roller.

Can adopt cylinder, with so that slidably element lean on to regulate wedge and be firmly held in its position of engagement, thereby the antagonism power that expanded material produced.Also can recall cylinder, thereby nip roller and following nip roller are unclamped each other, with so that material passes gearing apparatus or is connected with safety return circuit, said safety return circuit can be opened all machine nip point when activation.

Usually adopt drive unit to drive static nip roller.If for machine passes through or purpose of safety and second nip roller is unclamped; The then preferred gear arrangement that prevents backlash of between second and first nip roller, using; In order to guarantee that when remeshing the tooth of a nip roller always falls between the tooth of another nip roller.This characteristic has been avoided the potential destruction to physics contact between the tooth top of engaging tooth.If nip roller keeps constant engagement, then second nip roller need not drive usually.Can accomplish driving by driven nip roller through the material that is stretched to second roller.Tooth is not designed for transmitting driving torque, the contact of metal-metal does not take place in normal engagement stretched operation.

The instance of special preferred embodiment is Green Bay, and the stretcher that the Northern Engravingand Machine of WI makes, it adopts tooth pitch preferably about 0.155 " roller, yet about 0.040 " to 0.200 " tooth pitch also can accept.Tooth depth is preferably 0.280 ", however about 0.030 " to 0.500 " and tooth depth also can accept.The tooth density of roller perimeter is preferably each degree angle and has an appointment a tooth facing to the periphery of roller.Useful especially embodiment adopt Controllable Temperature built in about 50 to about 210

the IMG roller, more preferably temperature range be about 70

to about 190

.Can through employing be heated or cooling liquid in flow power system, external refrigeration/heating source, its combination, and known other temperature control of this area ordinary person and the maintenance method temperature of keeping roller.The preferred embodiment that is used for the control roll temperature is to pass being heated or the interior stream of cooling liquid of roller.This makes and can heat as required or cool off, and pair roller heats or cool off.

The depth of engagement of roller tooth has determined the elongation degree that tablet stood.Usually, the depth of engagement of roller tooth and precursor tablet confirm the stretching balance between forming, because the two can influence many important physical properties of tablet.Some factors that influence tooth pitch, tooth depth and the depth of engagement comprise the composition of tablet, desired final performance (gas permeability, absorbability, intensity, cloth sensation), and the width of IMG roller and diameter.The final application of tablet also can influence these to be selected, because it has determined desired final performance.The width of IMG roller demonstrates economy, and limitation-when width increased, the weight of roller also can increase with technological, and the amount of deflection that roller stood also can increase.Deflection and can produce difference not only in drawing process in the roller manufacture process, particularly when tooth pitch and tooth depth increase.The guidance that those skilled in the art adopt this paper to provide should be able to change the parameter of roller, to realize desired stretching.

Another embodiment of the present invention comprises and does not adopt the IMG roller and incremental ground stretching tablet of the present invention.In this embodiment, tablet can pass the roll gap of a series of rollers with different circumferential speed rotation.Roller can comprise the friction bearing surface, stretches to realize incremental.Also can be to said roller heating or cooling, with the expected performance of control tablet.

Tablet preferably includes non-woven material and film.Film is usually by polymer, for example polyethylene, polypropylene and combination thereof, said polyethylene such as low density polyethylene (LDPE) (LDPE), the mixture of straight-chain low density polyethylene (LLDPE) or LDPE and LLDPE.In one embodiment, film is by at least about 10 weight % or the about 10 weight % MDPE (intermediate density polyethylene) to about 50 weight %, and the LDPE of surplus, and the mixture of the blend of LLDPE or LDPE and LLDPE is processed.Film also can be by at least 10 weight % or the about 10 weight % HDPE (high density polyethylene (HDPE)) to about 50 weight %, and the LDPE of surplus, the mixture formation of the blend of LLDPE or LDPE and LLDPE.Every kind of material batching can comprise the other materials that for polymer, is generally low percentage.For example, film can comprise processing aid, colouring agent (like brightening agent) and surfactant.Term LLDPE used herein also comprises the LLDPE that adopts metalloscene catalyst to make, and is commonly referred to mLLDPE.

Film also can be processed for example natural or synthetic polymeric material by suitable elasticity material arbitrarily.The instance of suitable polymers comprises low crystallinity polyethylene, the low crystallinity polyethylene of metallocene catalyst, ethylene-vinyl acetate copolymer (EVA); Polyurethane; Polyisoprene, BS, styrene block copolymer be styrene/isoprene/styrene (SIS) for example; Styrene/butadiene/styrene (SBS), or styrene/ethylene-Butadiene (SEBS) block copolymer.Also can consider to use the blend of above-mentioned polymer, the elasticity of perhaps above-mentioned polymer and other modifications or the blend of non-elastic material.In certain embodiments, elastomeric material can contain high-performance elastomeric material, for example elastic block copolymer.The instance of suitable elastic block copolymer has KRATON, and it is Kraton Polymers of Houston, the registration mark of Texas.

Elastic membrane can comprise the top layer such as polyethylene blend, said top layer and elastic layer coextrusion and form the multilayer elastic material.The top layer can comprise the additive such as tackifier, low melting point polymer, and other components that can help cohesive process.

After IMG stretches, in the drawing process or when IMG stretches, non-woven material and elastomeric material are bonded to each other through engagement means.The many means that are used to combine all are that those skilled in the art are retrievable.The instance of engagement means includes but not limited to, thermal, and adhesive combines, combination of ultrasound, point combines, vacuum lamination, mechanical bond, solvent combines and chemical bond.Those skilled in the art are all very familiar to these known engagement means, can adopt arbitrary binding mechanism or its combination.

Thermal comprises two surface applied heat and pressure, thereby causes the necessary physics change that makes surface adhesion to required degree.Usually adopt the roll gap between the pair of rolls to apply said heat and pressure.Thermal can comprise that also adhesive combines, and the position that wherein expectation takes place to combine on one or two surface has the adhesive that applies on it.Usually, the existence of adhesive means that the temperature and pressure condition of milder promptly is enough to form combination.In addition, material to be combined can be coated with or otherwise contact with pressure-sensitive adhesive or responsive to temperature adhesive, when applying appropriate energy (heat or pressure), realizes herein combining.

Combination of ultrasound need for example make material pass through the process of accomplishing between sound angle and the backing roll usually, and for example United States Patent (USP) 4,374, in 888 and 5,591,278 set forth, it is reference that disclosure this paper of said document all draws with it.In the example property the stated method of combination of ultrasound, can each layer combined each other be fed in the combination pincers of ultrasound unit simultaneously.Commercially available various said ultrasound unit is arranged.Usually, these unit produce high-frequency vibrational energy, make the thermoplastic component fusing of layer interior binding site and combine.Thereby, the amount of the energy of inducting, in conjunction with the speed of component through pincers, the spacing of pincers and the quantity of binding site have determined the degree of adhesion between each layer.Can obtain high frequency, surpass 18, the frequency of 000cps (cycles per second) is commonly referred to ultrasonic, but according to adhesion desired between each layer and material chosen, low as 5,000cps even lower frequency also can produce acceptable combination.

Point combines to be usually included in a plurality of discrete points place combines one or more materials.For example, focus combines to comprise usually makes one or more layers to be combined through between the roller that is heated, and said roller comprises for example depiction roller and smooth felt wrapped roll.The patterning mode of engraved roll makes fabric on its whole surface, all not combine, and felt wrapped roll is normally smooth.Its result owing to functional and aesthetic property reason, shows the various patterns of engraved roll.

The adhesive lamination typically refers to and adopts one or more to put on the adhesive of tablet, to realize any means of two combinations between the tablet.Can adhesive be applied to tablet through such as with roller coat, spraying or via the means that fiber is used.Provide in the instance of suitable adhesive such as the United States Patent (USP) 6,491,776, it is reference that disclosure this paper of said document all draws with it.

United States Patent (USP) 4,995,930,5,591,510,5,635,275; 5,635,276,5,660,882,5,698,054; 5,762,643,5,733,628,5,783,014; 6,242,074 and 6,303,208 each self-described be called the lamination of vacuum forming laminating (VFL), through this method, under vacuum pressure when the continuous part of molten polymer sheet material through above the porous screen cloth time, be about to the tablet base material and fall within on the polymer sheet.It is reference that above-mentioned patent disclosure this paper separately all draws with it.The tablet base material can be that non-woven material maybe can be the polymeric substrate that approaches, and ventilative or gas impermeablely all can.Base material can be the single or multiple lift base material.

Thereby mechanical bond can mechanically combine and realizes that it means the lip-deep structure of each tablet of each layer employing and holds each other with a certain mode through a tablet being pierced through or being out of shape each layer.Hook-ocular form structure has been represented the instance of mechanical bond.Mechanical bond can IMG roller fin or tooth on " spike ", perhaps be preferably and send the rib formula that raises on the sheet roller or nail formula pattern and accomplish.Can combine with respective grooves Aided Machine in addition with incision IMG roller fin or tooth.

Referring now to the explained embodiment.Fig. 1 is the schematic diagram of embodiment of the present invention, and through this embodiment, non-woven material (11) and perforated film (10) raw material are fed to roll gap (12) with face-to-face relation, and from here through giving sheet roller (15) to be fed on the activation rolls (13 and 14).Fig. 1 just shows non-woven material and the perforated film from the roller charging, but those skilled in the art should be able to recognize many methods of supplying with tablet with above-mentioned relation each other that have.The suitable nonwoven material that is used for this method comprises commercially available non-woven material, One LakeviewPlace-Suite 204 Nashville for example, the Sofspan 200 that the BBA Nonwovens of TN37214 USA sells.The suitable perforated film that is used for this method comprises commercial membrane, Tredegar FilmProducts for example, Richmond, the elastic forming film of the commodity that VA sells FLEXAIRE by name.

If expectation, suitable media heating arbitrarily or

cooling activation rolls

13 and 14, said medium includes but not limited to electricity, steam, water, oil or other heat-transfer fluids.Tablet preferably is activated in the roll gap between activation rolls, then through tablet being combined against the pressure that one of activation rolls (14) puts on tablet by nip rolls (nip roll) (16).Remove from activation rolls (14) through the tablet of carry-over pinch rolls (17) then, and transfer to takers-in (18), although in embodiment of the present invention, can adopt the equipment of any appropriate to be used to receive the tablet of lamination, activation lamination and activation.From the viewpoint of economy, the advantage of on an equipment work-piece, implementing activation and combination is significantly, as after with the embodiment that provides in, with providing the evidence of investigating the product high-quality from the material property viewpoint.Yet those skilled in the art will be understood that embodiment of the present invention is included in activation rolls 13 and lamination is carried out in 14 downstream.

Another embodiment such as Fig. 2 elaboration.Non-woven material (21) and perforated film (20) raw material are fed to roll gap (22) with face-to-face relation once more, and are fed on the activation rolls (23 and 24) through sending sheet roller (25) from this.Yet in this embodiment, tablet combines through the nip rolls (28) that is heated in advance, and said nip rolls (28) directly is delivered to activation rolls (24) with unconjugated tablet.This method is better than other tooth portions that combines to occur in meshing gear that combines to be with the advantage of activation method tablet, in conjunction with after tablet in whole activation process, keep aliging with tooth.Thereby activation occurs in the not calmodulin binding domain CaM of tablet, and the prototype structure of tablet does not receive the influence of thermal as yet in the said not calmodulin binding domain CaM, thereby the activation expection can reach the most effective.

When product needed to be made, can be with another nip rolls (26) heating or cooling, and can be used to provide second to combine to the tablet of lamination, activation.Then through selecting to put on the temperature and pressure of tablet, before the scalable activation and the relative extent that combines after the activation by nip rolls 26 and 28.Roller 27 is the carry-over pinch rolls that the tablet of lamination are sent to takers-in from activation rolls 23.For obtaining best result, also can be like the words of needs with activation rolls (23 and 24) heating or cooling.

Another embodiment is shown among Fig. 3.In this embodiment, when tablet is between the tooth of roll gap of the meshing gear on activation rolls 33 and 34, in conjunction with taking place simultaneously with activation.In the case, the heat energy that is produced by activation rolls is enough to cause adhesion.Can non-woven material (31) and perforated film (32) raw material be fed to roll gap (32) with face-to-face relation, and from this on the activation rolls of sending sheet roller (35) to be fed to be heated (33 and 34).In this embodiment, when taking place simultaneously to combine in the roll gap between

roller

33 and 34, do not exist the activation tablet is applied the nip rolls facing to the pressure of activation rolls (34) with activation.For facility combination in this way, can adhesive be put on film 30, what preferably use is pressure-sensitive adhesive.Suitable adhesive is by National Starch & Chemical Company, Bridgewater, the NS34-5647 that NewJersey is commercially available.To combine the tablet of also activation to remove by carry-over pinch rolls (36) then, and the tablet of lamination will be supplied to takers-in 37 from roller 34.

Embodiment

(Sofspan 200 is by One Lakeview Place-Suite204 Nashville by being prepared as follows non-woven material; The BBA Nonwovens of TN37214 USA provides) and the sample of elastic forming film (forming the elasticity perforated film of 3D shape through using vacuum): (i) double-layer lamination body has one deck non-woven material on the sunny side of formed film (for example perforate stop face); (ii) three layer laminate all have one deck non-woven material on each face of formed film.To one group of sample; Through use sufficient Krylon All Purpose 7010 spraying adhesive at each face of film layered product is combined, exerting pressure then combines guaranteeing fully.For another group sample, this sample is lamination not.Compound tablet sample is gone up with the stretching of 200mm/min speed in MTS Synergie 200 tensile testing apparatus (MTSSystems Corporation, Eden Prairie Minnesota), and measuring length is 2 inches (50.8mm).The result is as shown in table 1.

Table 1

The tension force performance of the lamination tablet of activation

Sample	A	B
			The layered product state	Do not combine	In conjunction with
?	?	?
			MD tension force 200%	23927	27158
MD percentage elongation during fracture	439	257
			?	?	?

The sample of test is two layered products." combine " material combines before being, but the existing elastic membrane that quite combines and independent non-woven material during activation." combination " material is to get into the identical elastic membrane that combined before the activation and the layered product of non-woven material.Data in the table disclose, and compare with the layered product that has combined before the activation, and unconjugated laminated material has more excellent elastic performance.

From table 1, can know and find out, can see that wherein unconjugated tablet has higher extension fracture value with the advantage of unbound state with tablet activation simultaneously.Higher stretch value shows that the comparable combination sample of bond material more can not bear violent activation.In addition, and compare with the tablet of bonding state activation, more soft thus with the compound tablet feel of unbound state activation.

Although disclosure that as above provides and embodiment are confined to some particularly preferred embodiment; But will be appreciated that; Through other obvious embodiments of those skilled in the art; Can obtain being better than other similar advantages of prior art, and can do various changes and correction, and can not depart from the purport and the scope of embodiment of the present invention foregoing.All these type of correction expections comprise by the scope of accompanying claims.

Claims

1. the production method of compound tablet, it comprises:

(i) at least one non-woven tablet is fed into a stretching device with a porose elastic membrane with face-to-face relation; Said stretching device be used to stretch said non-woven tablet and said porose elastic membrane are stated non-woven tablet in said stretching device place and said porose elastic membrane is in unbound state each other;

(ii) when said non-woven tablet and said porose elastic membrane are in face-to-face relation and are in unbound state; Said non-woven tablet is stretched with said porose elastic membrane; To promote flexibility, produce activation and unconjugated non-woven tablet and porose elastic membrane; And

(iii) adopt coupling apparatus; Said activation and unconjugated non-woven tablet and porose elastic membrane are combined with face-to-face relation; Thereby form compound tablet, wherein said non-woven tablet is by being selected from fibrous that polyethylene, polypropylene, polyester, man-made cellulose fibers, cellulose, nylon and their mixture process.

2. the process of claim 1 wherein that stretching device comprises two or more rollers that have meshing gear.

3. the process of claim 1 wherein that coupling apparatus comprises the device that is selected from thermal, adhesive combination, some combination, mechanical bond, combination of ultrasound, solvent combination and combination thereof.

4. the method for claim 2 wherein combines to occur in two roll gaps between the engaging tooth supporting-point roller.

5. the method for claim 2; Wherein combine to occur in after said non-woven tablet and said porose elastic membrane be stretched; And wherein through applying power through said non-woven tablet and said porose elastic membrane against the tooth of engaging tooth supporting-point roller by nip rolls; Make to combine to occur in the roll gap between one of nip rolls and engaging tooth supporting-point roller, said power is enough between said non-woven tablet that contacts with each other and said porose elastic membrane, form and combines.

6. the compound tablet that makes by the method for claim 1.

7. the absorbing products that contains the compound tablet of claim 6.